JPH0555679B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is useful for constructing underground structures such as underground passages under railway tracks or roads before burying the structures. This invention relates to the structure of a pipe roof equipped with an edge plate to prevent the ground above the structure from moving when the structure is buried.

(Prior Art) Conventionally, as a countermeasure against railroad crossing accidents and traffic congestion, for example, structures such as underground passages that intersect with railroad tracks are constructed underground.

As shown in Figures 8 and 9, the method for constructing such an underground structure is to excavate shafts B and B' on both sides of the planned underground structure across the track A, and to excavate vertical shafts B and B' at appropriate locations under the track A. After constructing a pipe roof protection work by horizontally press-fitting a large number of steel pipes C in close parallel to each other in a direction approximately perpendicular to the track A into the ground at a deep depth, the pipe roof is installed from one shaft to the other. A method has been implemented in which a tunnel is excavated while constructing a support D that supports the earth retaining and steel pipes on the side toward the vertical shaft.

(Problem to be Solved by the Invention) However, according to this method, the steel pipe C is buried underground, thereby supporting the track A and the earth cover E, and constructing an underground passage under it. Therefore, in addition to the earth cover E and the diameter of the steel pipe C, a work space is required between the underpass top and the pipe roof, and the underpass must be built deeper by this amount. .

Therefore, the approach slope F of the underground passage becomes steep, the slope part becomes long, and the steel pipe C
There were problems such as high construction costs because the walls could not be removed.

An object of the present invention is to provide a pipe roof for constructing underground structures that can solve these problems.

(Means for Solving the Problems) In order to achieve the above object, the pipe roof for constructing underground structures of the present invention has the following features:
A pipe roof is buried in advance over the entire length between the two shafts before the underground structure is propelled and buried underground, and this pipe roof is connected to the underground structure when the underground structure is propelled. A plurality of hollow pipes with a rectangular cross section to be replaced are arranged in parallel, and an edge cutting plate made of a steel strip having approximately the same width and length as the hollow pipe is placed on the upper surface of each hollow pipe. In addition, the tip of this edge cut plate is fixed to the tip of the hollow pipe, and when the underground structure is propelled or press-fitted, the tip of the edge cut plate is released from the tip of the hollow pipe and fixed underground. The structure is characterized in that the underground structure is replaced with a plurality of hollow pipes along the lower surface thereof.

(Function) The edge cutting plate is placed on a hollow pipe with a rectangular cross section that forms the pipe roof, and its tip is integrally fixed to the tip of the hollow pipe, so it can be easily inserted into the ground together with the hollow pipe. It can be press-fitted into.

After this hollow pipe mounted on the edge cut plate was buried between the starting shaft and the destination shaft, the tip of the edge cut plate and the tip of the hollow pipe were unfastened, and the edge cut plate was fixed underground using an appropriate fixing means. If the front end of the underground structure is brought into contact with the rear end of the hollow pipe and the underground structure is propelled, the hollow pipe and the underground structure will move toward the reaching shaft side while sliding against the bottom surface of the hollow pipe using the cutting plate as a guide. The hollow pipe and underground structure are replaced, and the edge cutting board is left underground.

In this way, since the hollow pipe constituting the pipe roof is removed, the depth of construction of the underground structure becomes shallower by an amount corresponding to the diameter of the hollow pipe, and the slope of the approach to the underground structure is made gentler and the slope The length can be shortened, and the hollow pipe can be used on the ground after being removed, which is economical. In addition, because the rim plate is left underground, not only is it impossible to move surface soil when replacing a hollow pipe with an underground structure, but also the rim of a wide underground structure cannot be moved. It can be smoothly propelled along the lower surface of the cutting board.

(Example) Next, an example of the present invention used in a method for constructing an underground structure that crosses under a track will be described based on the drawings.

This underground structure 1 is for a roadway, and as shown in FIG. The upper floor member of the underground structure 1 is constructed between the upper surfaces of the abutments 4, 4, and the lower floor board 6 is further installed between the bottoms of the abutments 4, 4.

To construct such an underground structure 1, first, shafts 7 and 8 are excavated in the ground on both sides of the track 2, and then the starting shaft 7 is excavated at the location where the upper floor components of the planned underground structure 1 are planned. A hollow pipe 9 having a rectangular cross section is horizontally press-fitted in a direction that crosses the track 2.

At this time, insert an excavator such as an auger (not shown) into the hollow pipe 9 and press the rear end of the pipe with a jack while excavating the ground below the track surface until it reaches the other vertical shaft 8. However, the excavated soil is transported backwards inside the pipe by an auger screw.

As shown in FIGS. 1 and 2, this hollow pipe 9 is
The tip surface thereof is formed into a blade portion 9a that slopes inwardly, and protrusions 10, 10, 11, 11 are provided protruding in the length direction at the upper and lower ends of both side surfaces,
In addition, the dimension between the opposing inner surfaces of the protrusions 10, 10 on one side is made equal to the dimension between the upper surface of the upper protrusion 11 and the lower surface of the lower protrusion 11 on the other side.

Further, on the upper surface of the hollow pipe 9, an elongated rectangular edge plate 12 made of a strip steel plate having a width approximately equal to the width of the hollow pipe 9 is placed over the entire length of the hollow pipe 9. Only the tip is a hollow pipe 9
It is fixed to the tip by screws, welding, or other means.

In this way, after the hollow pipe 9 on which the edge cutting plate 12 is placed is press-fitted into the ground as described above, the opposite side of the next hollow pipe 9 is similarly aligned with the side of the hollow pipe 9. Article 10,1
0, 11, and 11 are press-fitted in a state in which they are engaged with each other and not misaligned in the vertical direction, and by repeating this operation, the adjacent side surfaces are brought into close contact with each other, and a plurality of hollow pipes 9 are arranged in parallel in the horizontal direction.
The pipe roof 13 is formed by the pipe roof 13. The width of this pipe roof 13 is the width of the underground structure 1
The width is approximately equal to the width of the upper floor member.

Next, a plurality of circular pipes 14 are attached to both ends of the pipe roof 13 as necessary.
After the tubes are press-fitted in parallel in the width direction, abutments 4, 4, which will become the walkway 3, are constructed on the ground below both sides of the pipe roof 13 by a known method, as shown in FIG. 15 is the shoring at that time, 1
6 is the dome sheet pile.

Next, support piles 17, 17 are driven from the ground surface toward the upper surfaces of both sides of the abutment 4, and the support piles 17, 17 are
By constructing a construction girder 18 between the construction girders 17 and 17, the track 2 is received by the construction girder 18, and then,
The ground under the construction girder 18 is excavated, the pipes 9 and 14 on the abutment 4 are removed, and the guide step 20 is installed on the abutment 4.
A seat 19 having an L-shaped cross section is cast and formed over the entire length of the abutment 4 as shown in FIG. The upper surface of the stepped portion 20 of this catch seat 19 is connected to the pipe roof 13.
It is either on the same plane as the bottom surface or slightly elevated.

In this way, the stepped portions 2 are placed on the upper surfaces of both abutments 4, 4.
0 and 20 are installed in parallel, a prefabricated upper floor member 5 having the same thickness as the pipe roof 13 but slightly thinner is horizontally placed in one shaft 7. Pipe roof 13 on the front end surface
A plurality of jacks 22 are placed in contact with the rear end surface and between the rear end surface of the upper floor member 5 and a reaction wall 21 provided on the wall surface of the shaft 7, as shown in FIG.

Before operating the jacks 22, remove the bolts or cut off the fixed ends of the edge cutting plates 12 placed on the top surfaces of all the hollow pipes 9 that make up the pipe roof 13. While untying from the tip, the rear ends of all edge cutting plates 12 are fixed to the reaction wall 21 with turnbuckles 23 or the like.

After that, when the jack 22 is operated to press the upper floor member 5, the pipe roof 13 is moved to the edge cutting plate 12.
The upper floor member 5 is pushed out into the reaching side shaft 8 while slidingly contacting the lower surface of the upper floor member 5, and moves forward while being guided on the lower surface of the edge cutting plate 12 and the stepped portion 20 of the seat 19.

At this time, the retaining pile 17 above the pipe roof 13 is received on the edge cutting plate 12, and the edge cutting plate 1
2 is fixed with turnbuckles 23, etc., so that even though the pipe roof 13 moves, the retaining piles 17 and the earth and sand 24 on the surface layer do not move.
There is no risk that construction girder 18 or track 2 will move.

In addition, the upper floor member 5 is formed into a plate shape using concrete mainly composed of a plurality of parallel H steels 25, and its length may be formed to be equal to the total length of the underground structure 1, and It may be divided.

In this way, the upper floor member 5 of the underground structure 1 is advanced along the lower surface of the edge cutting plate 12 left underground, and the pipe row of the pipe roof 13 is moved into the reaching side vertical shaft 8.
The upper floor member 5 and the pipe row are replaced by extrusion.

Next, the construction girders 18 and earth retaining piles 17 are removed, and the space is backfilled with earth and sand, and further, from the starting side shaft 7 side to the arrival side shaft 8, between the lower surface of the upper floor member 5 and the side surface of the abutment 4, 4. The surrounded ground is excavated, the earth retaining sheet pile 16 is removed, and the subfloor board 6 is laid down, or concrete is poured into the ground.
This is to construct an underground structure 1.

(Effects of the Invention) As described above, according to the structure of the pipe roof for constructing underground structures of the present invention, when constructing an underground structure in the ground between the departure side vertical shaft and the destination side vertical shaft, the underground structure A pipe roof that is buried over the entire length between the compatible shafts before an object is propelled and buried underground, and this pipe roof is replaced with the underground structure when the underground structure is propelled. Multiple hollow pipes with a rectangular cross section are installed side by side,
An edge cutting plate made of a strip steel plate having approximately the same width and length as the hollow pipe is placed on the upper surface of each hollow pipe, and the tip of this edge cutting plate is fixed to the tip of the hollow pipe. When the cutting plate is used to promote the underground structure and press fit, the fixed part of the tip is released from the tip of the hollow pipe, and while it is fixed underground, the underground structure and the plurality of hollow pipes are replaced along the lower surface of the plate. Since the edge cutting plate is placed on a hollow pipe with a rectangular cross section that forms the pipe roof, and its tip is integrally fixed to the tip of the hollow pipe, this edge By sequentially press-fitting and burying the cut plates together with the hollow pipe into the ground, it is possible to easily form a pipe roof having a desired width over the entire length between the departure side shaft and the destination side shaft.

Furthermore, after burying this pipe roof, the tip of the edge cut plate and the tip of the hollow pipe are unfastened, and only the edge cut plate is fixed in the ground with an appropriate fixing means. With the front end surface of the underground structure in contact with the rear end surface of the roof over the front width of the pipe roof, all the hollow pipes forming the pipe roof and the underground structure are connected to the bottom surface of the edge cutting plate. The pipe roof can be smoothly propelled toward the reaching shaft side while sliding in contact with the pipe roof, and the pipe roof and the underground structure can be easily replaced.

Since the pipe roof and the underground steel structure are replaced in this way, the construction depth of the underground structure can be reduced by an amount corresponding to the thickness of the pipe roof, and therefore the slope of the approach to the underground passage can be reduced. The slope can be made gentler and the slope length can be shortened, and
Since the plurality of hollow pipes forming the pipe roof are pushed out into the reaching side shaft and removed, the hollow pipes can be reused, which is economical.

In addition, since the plurality of edge cutting plates are left in parallel and left underground, even when replacing the pipe roof with a wide underground structure, there is no need to move the earth and sand on the surface layer. There is no risk of adverse effects on the above ground side, and construction work of underground structures can be carried out efficiently.

[Brief explanation of the drawing]

1 to 7 show embodiments of the present invention, in which FIG. 1 is a front view of a hollow pipe with a rectangular cross section on which an edge cutting plate is mounted, FIG. 2 is a partially vertical side view of the pipe, and FIG. Figures 4 and 4 are simplified longitudinal sectional front views for explaining the construction method of the pipe roof and both bridge abutments, and Fig. 5 is a simplified vertical sectional front view with the pipe roof and upper floor members of the underground structure replaced. Figure 6 is a simplified vertical side view showing the replacement method, Figure 7 is a simplified vertical front view of the constructed underground structure, Figure 8 is a simplified vertical side view to explain the conventional construction method, and Figure 9 is a simplified vertical side view showing the replacement method. It is a simplified vertical front view. 1... Underground structure, 5... Upper floor member of underground structure, 7... Starting side shaft, 8... Arrival side shaft, 9...
...Hollow pipe, 12...Edge cutting plate, 13...Pipe roof.

Claims (1)

[Claims] 1. When constructing an underground structure in the ground between the starting side shaft and the destination side shaft, a pipe that is buried in advance over the entire length between the two shafts before propelling and burying the underground structure underground. This pipe roof has a plurality of hollow pipes with a rectangular cross section arranged in parallel to replace the underground structure when the underground structure is propelled, and the hollow pipe is arranged on the upper surface of each hollow pipe. An edge cutting plate made of a strip steel plate having approximately the same width and length as the hollow pipe is placed, and the tip of the edge cutting plate is fixed to the tip of the hollow pipe. It is characterized by being configured such that the fixed end portion is released from the tip of the hollow pipe during press-fitting, and the underground structure and the plurality of hollow pipes are replaced along the lower surface of the hollow pipe while being fixed underground. Pipe roof structure for building underground structures.